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Lifestyle Survey Toolkit

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SPSS Data Analysis

The example given in the page on confidence intervals is from the Bradford City lifestyle survey in 2005. The table below is from the ‘Explore’ function in SPSS. It gives the mean proportion who smoke nowadays as 25.04%, with a 95% confidence interval of 22.89% to 27.20%.

      Statistic Std. Error
Smoke nowadays Mean   .2504 .01100
  95% Confidence Lower Bound .2289  
  Interval for Mean Upper Bound .2720  
  5% Trimmed Mean   .2227  
  Median   .0000  
  Variance   .188  
  Std. Deviation   .43341  
  Minimum   .00  
  Maximum   1.00  
  Range   1.00  
  Interquartile Range   1.00  
  Skewness   1.153 .062
  Kurtosis   -.671 .124

The following bar chart shows the proportion who smoke with the confidence interval shown on the bar.

 

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